Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebd82d6c966df4b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 13:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27992105b6299c7981762ecf0c7a45d6 SHA-1: a6a6d53b79e910e0e8598b434b98131dfcd52092 SHA-256: 3ebd82d6c966df4b6e89ad630bccf15a73e9163dc6945ef1a506b752a924a960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern observed is the use of a link farm to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://newtarrytowndeli.com/uploads/files/78069132867.pdf In PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613369fa70dc3---boxurasovujujunanez.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/divomimonosok.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/83aad6d49e360bcfbc5fac5b1d4ff896/nukobelifejiwiwow.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/teguguniwede.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63844228761.pdfIn PDF document text
    • https://rajakedua.com/contents/files/18390742404.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17acee8a1---gazakedumevonazaxafibo.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/fegukodozajel.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ace3026a3071878aaa94a83d530978cd/79755917876.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/68634539095.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/darifumajo.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/14265470369.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/rulij.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/66098978087.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/mumofojiguto.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/93042148897.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/9248495657.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613073de3dfe5---balokukisabaxar.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/dutafalosidasivosaz.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/lakol.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/60785161941.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/20433338968.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f397a92ad---majoribisiva.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/76033567928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minerva+mills+case+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 18396 bytes
SHA-256: 24f704f460a23a5e3ba1552307a482ebfe39dce4128546e79ffbc0ffc24dd33d
font_01_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 10624 bytes
SHA-256: 78efd0749e6fb02b1e30efc1276a5987bb7081caf2edeba587bb2678687dc991
font_02_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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